<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
  <style>
    .main {
      background-color: white;
    }
    .center {
      width: 1100px;
      margin: 0 auto;
    }
    .f1 {
      margin: 10px;
      border: none;
      overflow: hidden;
    }
    .left {
      /*border: 1px solid black;*/
      background-color: grey;
      width: 611px;
      height: 376px;
      float: left;
      margin-right: 10px;
    }
    .right {
      /*border: 1px solid black;*/
      background-color: yellow;
      width: 375px;
      height: 376px;
      float: left;
      margin-right: 8px;
    }
    .f2 {
      margin: 10px;
      border: none;
      overflow: hidden;
    }
    .f2>.left {
      /*border: 1px solid black;*/
      background-color: pink;
      width: 366px;
      height: 233px;
      margin-right: 20px;
      float: left;
    }
    .card {
      /*border: 1px solid black;*/
      width: 198px;
      height: 233px;
      background-color: #0aa1ed;
      float: left;
      margin-right: 8px;
    }
  </style>
</head>
<body>
<div class="main">
  <div class="center">
    <div class="f1">
      <div class="left"></div>
      <div class="right"></div>
    </div>
    <div class="f2">
      <div class="left"></div>
      <div class="card"></div>
      <div class="card"></div>
      <div class="card"></div>
    </div>
  </div>
</div>
</body>
</html>